T-Mobile US Officer Files Form 144 Notice of Proposed Sale

Executive Summary

On September 10, 2026, Daniel James Drobac, an Officer of T-Mobile US, Inc. ($TMUS), submitted a Form 144 filing announcing the intention to sell 772 shares of common stock with an estimated market value of $137,670.76.

Transaction Details

• Security: Common Stock
• Proposed Sale Quantity: 772 shares
• Aggregate Market Value: $137,670.76 (~$178.33/share)
• Broker: Fidelity Brokerage Services LLC
• Approximate Date of Sale: September 10, 2026
• Source of Shares: Restricted stock vesting acquired directly from the issuer on August 15, 2026 (241 shares) and August 25, 2026 (531 shares) as equity compensation.
• Trading Plan: Executed pursuant to a Rule 10b5-1 trading plan adopted on June 11, 2026.

Market Impact & Significance

This filing carries Low trading significance due to the small transaction size ($137.7K) relative to T-Mobile's market capitalization and liquidity, as well as the pre-scheduled nature under a Rule 10b5-1 plan following recent restricted stock vestings.